package com.fish.helloworld;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {	private TextView m_TextView;	private backButton_OnClickListener backButtonListener = new backButton_OnClickListener();	private clearButton_OnClickListener clearButtonListener = new clearButton_OnClickListener();		class backButton_OnClickListener implements OnClickListener{		public void onClick(View v){			m_TextView.setText("back");		}	}		class clearButton_OnClickListener implements OnClickListener{		public void onClick(View v){			m_TextView.setText("clear");		}	}		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.skeleton_activity);				m_TextView = (TextView)findViewById(R.id.text1);		final Button backButton = (Button)findViewById(R.id.back);		final Button clearButton = (Button)findViewById(R.id.clear);				backButton.setOnClickListener(backButtonListener);		clearButton.setOnClickListener(clearButtonListener);	}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/text1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/text1" />            <Button        android:id="@+id/back"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/back" />    <Button        android:id="@+id/clear"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/clear" /></LinearLayout>